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One can receive a PKI certificate, or a public-key infrastructure certificate, is by digitally signing and publishing the public key bound to a given user.
Embedding the public key in a digital certificate protects it from impersonators by associating and binding a user's identity to the public key. A digital certificate is the user's public key that has been "digitally signed" by a trustworthy source trusted to sign it. And, instead of "trustworthy" you could use the word: reputable.
Certificate Server (CS)
PKI or Public Key Infrastructure
certificate authority
what is the key difference between a protosun and the real sun?
There is no difference.
digital certificate (aka digital ID, digital signature)
The main difference between public wants and private wants in business is the key words private and public. Private is personal clientele and their personal needs such as jets, hotels, and restaurants. Public wants are governments costs, marketing, and such.
digital certificate
digital certificate
Cross-Certificates OverviewA cross-certificate is a certificate issued by one Certificate Authority (CA) that signs the public key for the root certificate of another Certificate Authority. Cross-certificates provide a means to create a chain of trust from a single, trusted, root CA to multiple other CAs.